feat: extract bookmarks as standalone module with MintyPHP\Module\Bookmarks namespace

Moves bookmarks from core hardcoding into modules/bookmarks/ as a
fully self-contained module, following the same pattern as addressbook.

Module contributions via platform slots:
- aside.tab_panel: bookmark sidebar panel
- topbar.right_item: bookmark toggle button
- layout.body_end_template: bookmark/group dialogs
- layout.head_style: bookmark CSS (form + sidebar)
- runtime.component: bookmark-save and bookmark-panel (phase: late)
- search.resource_item: bookmarks in global search (user-scoped via {{userId}})

Backend fully in module namespace (MintyPHP\Module\Bookmarks\*):
- Service: BookmarkService, BookmarkServicesFactory, BookmarkRepositoryFactory
- Repository: BookmarkRepository, BookmarkGroupRepository, BookmarkNavigationRepository
- Support: BookmarkUrlNormalizer
- Providers: BookmarksSessionProvider, BookmarksLayoutProvider, BookmarksSearchProvider

Core cleanup:
- Removed all bookmark-specific markup from core templates
- Removed core DI registrations for bookmark services
- Removed core bookmark pages, JS, CSS
- AuthSessionTenantContextService delegates to module SessionProvider

Architecture guards:
- NoBookmarksHardcodingTest: verifies zero bookmark references in core
- testModuleClassesUseModuleNamespace: prevents core namespace leakage

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

templates/partials/app-bookmark-dialog.phtml

@@ -1,96 +0,0 @@
-<?php
-
-use MintyPHP\Http\SessionStoreInterface;
-use MintyPHP\Service\Bookmark\BookmarkService;
-
-$bmSessionData = is_array(app(SessionStoreInterface::class)->get('user_bookmarks')) ? app(SessionStoreInterface::class)->get('user_bookmarks') : [];
-$bmSessionGroups = is_array($bmSessionData['groups'] ?? null) ? $bmSessionData['groups'] : [];
-
-?>
-<dialog
-  data-app-bookmark-dialog
-  data-app-component="bookmark-save"
-  data-max-message="<?php e(t('Maximum bookmarks reached')); ?>"
-  data-title-create="<?php e(t('Bookmarks')); ?>"
-  data-title-edit="<?php e(t('Bookmarks')); ?>"
-  data-label-save="<?php e(t('Save')); ?>"
-  data-label-update="<?php e(t('Save')); ?>"
-  data-msg-saved="<?php e(t('Bookmark saved')); ?>"
-  data-msg-updated="<?php e(t('Bookmark updated')); ?>"
-  data-msg-group-created="<?php e(t('Group created')); ?>"
-  data-msg-error-generic="<?php e(t('Bookmark action failed')); ?>"
-  data-msg-group-create-failed="<?php e(t('Group action failed')); ?>"
-  data-msg-name-required="<?php e(t('Bookmark name is required')); ?>"
-  data-msg-url-required="<?php e(t('Bookmark URL is invalid')); ?>"
-  data-msg-group-not-found="<?php e(t('Group not found')); ?>"
-  aria-labelledby="app-bookmark-dialog-title"
->
-  <article class="app-bookmark-dialog">
-    <header>
-      <h2 id="app-bookmark-dialog-title"><?php e(t('Bookmarks')); ?></h2>
-      <button type="button" class="close" data-bookmark-dialog-close aria-label="<?php e(t('Close')); ?>" title="<?php e(t('Close')); ?>"></button>
-    </header>
-    <form data-bookmark-save-form>
-      <label for="bookmark-name"><?php e(t('Name')); ?></label>
-      <input type="text" id="bookmark-name" name="name" maxlength="120" required
-        placeholder="<?php e(t('Bookmark name')); ?>">
-      <label for="bookmark-group"><?php e(t('Assign to group')); ?></label>
-      <select id="bookmark-group" name="group_id" data-bookmark-group-select>
-        <option value=""><?php e(t('No group')); ?></option>
-        <?php foreach ($bmSessionGroups as $grp):
-          $grpId = (int) ($grp['id'] ?? 0);
-          $grpName = trim((string) ($grp['name'] ?? ''));
-          if ($grpId <= 0 || $grpName === '') { continue; }
-        ?>
-          <option value="<?php e($grpId); ?>"><?php e($grpName); ?></option>
-        <?php endforeach; ?>
-      </select>
-      <button type="button" class="outline secondary app-bookmark-new-group-btn" data-bookmark-new-group>
-        <i class="bi bi-plus"></i> <?php e(t('New group')); ?>
-      </button>
-      <footer>
-        <button type="submit" class="app-action-success" data-bookmark-submit-label><?php e(t('Save')); ?></button>
-      </footer>
-    </form>
-  </article>
-</dialog>
-
-<dialog
-  data-app-bookmark-group-dialog
-  data-title-create="<?php e(t('New group')); ?>"
-  data-title-edit="<?php e(t('Edit group')); ?>"
-  data-label-save="<?php e(t('Save')); ?>"
-  data-label-update="<?php e(t('Save')); ?>"
-  data-max-message="<?php e(t('Maximum groups reached')); ?>"
-  data-msg-created="<?php e(t('Group created')); ?>"
-  data-msg-updated="<?php e(t('Group updated')); ?>"
-  data-msg-error-generic="<?php e(t('Group action failed')); ?>"
-  data-msg-name-required="<?php e(t('Group name is required')); ?>"
-  aria-labelledby="app-bookmark-group-dialog-title"
->
-  <article class="app-bookmark-dialog app-bookmark-group-dialog">
-    <header>
-      <h2 id="app-bookmark-group-dialog-title"><?php e(t('New group')); ?></h2>
-      <button type="button" class="close" data-bookmark-group-dialog-close aria-label="<?php e(t('Close')); ?>" title="<?php e(t('Close')); ?>"></button>
-    </header>
-    <form data-bookmark-group-save-form>
-      <label for="bookmark-group-name"><?php e(t('Group name')); ?></label>
-      <input type="text" id="bookmark-group-name" name="name" maxlength="100" required
-        placeholder="<?php e(t('Group name')); ?>">
-      <label><?php e(t('Icon')); ?></label>
-      <div class="app-bookmark-group-icon-picker" data-bookmark-group-icon-picker>
-        <?php foreach (BookmarkService::allowedGroupIcons() as $allowedIcon): ?>
-          <button type="button" class="app-bookmark-group-icon-option"
-            data-icon="<?php e($allowedIcon); ?>"
-            aria-label="<?php e($allowedIcon); ?>">
-            <i class="bi <?php e($allowedIcon); ?>"></i>
-          </button>
-        <?php endforeach; ?>
-      </div>
-      <input type="hidden" name="icon" value="bi-folder">
-      <footer>
-        <button type="submit" class="app-action-success" data-bookmark-group-submit-label><?php e(t('Save')); ?></button>
-      </footer>
-    </form>
-  </article>
-</dialog>